Hand-hole cover.



W. SELLERS & H. B. BRADFORD.

' HAND HOLE COVER.

APPLIOATIOH rmm' MAY 24, 1912.

1,1 05,21 2.. v Patented July 28, 191:1

I 2 g INVENTORS BY M ATTORNEY UNITED srArns PATEN orrron.

ILLIAM F. SELLERS AND HENRY B. BRADFORD, or nDGnMoom-nELAWARn, -AssIen- ORS TO EDGE MOOR FRON GQMPANY, OF EDGEMOOR, DELAWARE, A CORPORATION OF DELAWARE.

' mNn HoLn oovnn.

' Specification of Letters Patent.

To all whom itmag concern:

Be it known that we, WILLIAM F. SELLERS.

and HENRY -B. BRADFORD, citizens Q of the United States, residing in Edgeinoor, Brandywine and State of Delaware, have inventedhvcen tainnew and useful lmprovementinifland Hole Covers, of which the followinggis a true and exact description, reference had tothe accompanying drawings,

form a part thereof. Our invention relates to the construction of; hand hole covers or the likeaandhas for itsobject primarily to provide a cover of such a character that it can be inserted' in the round hole "itis to close from the out 'side aridfwheh'turned to closing posltlon will fit inand against a seat in the hole in C such manner that even apart from the use of a gasket or packingthe cover can not be .f g the 1101c and will substan- -nany closei Further objects of our-invention new improve the means for holding the cover in 'Losition, the characterof the jointforrhed y ity in the holeit closes and to provide improved means for holding the cover while the nut clamping it' in place. is being un-- screwed. The nature of our improvements Wlll be best understood as described in connection trated and in which Ais-a scar a ,.,'iormed in it, the outer. edges "A' of which with the drawings in which they are illus- Figure 1 is a view of the hand hole cover 'and'feonnections taken" on the section line are at right'angles' to: the surface of the plateas showman'd the inner edge A? of-thej hole is chamfered to form a more acute angle to the horizontalplane ofthe hole. At A, A", we have shown walls. ofthe boiler header extending atan angle to its face.

B is the hand hole cover, the peripheral edge 0 of which is'tapered outwardly as shown in the general form of a cone, the tapered edge of thecover being in the upperundred, county of Newcastle,

or innerlportion of greater diameter than the smaller or outer portion of'the hole, the

Patented July 28, 1914. Application filed'May 24, 1912. Serial No. 699,467.

relative proportion of the parts being p'referably' such that'the cover will seat itselfin the hole with its outer end'extend'ing a'short distan'ce'beyond the outer edge of the hole when no packing or gasket is interposed. In order to. enable this cover to be inserted n; "the hole from outside, we 'chamfer or bevel-off the inner portions of the tapered edges of the cover on opposite sides as shown atD, D; thus reducing the diameter of the cover in one direction to such an extent that it'cen' pass edgewise through the hole, while, when turned to parallelism Wlthfthe hole, it in it and effectively close it except for very small"clearances at the chamfered portions. v

E is afinger extending laterally from the inside of the cover and its function is to abut against an obstruction, such as wall A, and prevent the cover from rotating in the hole. i

G is a gasket or packing ring of. homogeneous metal of a hardness suitable to the pressure to be carried by the joint. It is usually of copper, though iron or steel may be used with advantage when very high seat- 0f the hole and, as, clearly shown, forms with the cover a close joint all around the hole. -The gasket is of course inserted after the coverhas been introduced into the hole and before it is drawn intoclosi'ng position.

F is'the cover holding yoke which. weform of dome shape and with its edge F lapping the edge of the hole so as to form an abutmerit for the outer edges of thegasket G and prevent its being drawn through ortoo far lnto the hole whenithe joint is being made up, The yoke F is formed with a central bolt hole F through which extends the boltH secured to the cover in any convenient wayandupon the outer end of which screws the nutH by which the cover is drawninto the hole. A X

The strains involved I, are sometimes so great that wehave found it most desirable to preserve the dome shape 'ofthe yoke and to form. no openings in .it except the bolt hole, so that should the nut H become rusted or by other cause fast to the bolt the utility of the finger E on the cover becomes apparent as it prevents the rotation of the cover when the nut H is being unscrewed:

pressuresare involved, this gasket fits in the Having now described our invention, what we claim as new and desire to secure by Letter srPatent is;

1.A hand hole cover for a round hole in a boiler head or plate having a conical body. larger in diameter at its inner end than the hole to beclosed and adapted to fit. in the hole-and against the inner edge which lies inside of the hole, said conical body of the cover being at its larger end cut away or;

chaanferedlon opposite sides to reduce its width? in one direction to a distance less than the diameter of the hole whereby the'cover can bepassed edgewise through the hole to be closed and then drawn into the hole-until Y the un'chamfered portions of its conical body are arrested of the hole. a

' 2. A hand hole cover fora round hole a boiler head or plate comprising a body having a conical outer end Eportion adapted said hole but cut away or chamfe'red at op:

' projectingfinger extending'from its inner to cnter'the hole to be close hole and a flexible bushin said outer end portion being smaller in diameter at its larger end than said hole and having an inner end {portion of larger diameter than posite sides to such extent 'as to permit the cover to be passed'edgewise through said -surrounding said conical end. portion andndapted to be wedged between and to seal the joint be.- t ween the latter and theperipheral wall of the hole to be closed- 3. A hand vhole coverfpr around hole in a boiler head or plate, comprising a conical body larger in diameter at its large end and smallerzin diameter at its small end than the holejto be closed, and having opposite sides of itislarger end cut away or chamfered to make, the corresponding width of the body less {than the diameter or the hole whereby the'vcover; may be passed edgewisethroug h the hole, said cover also having alaterally portion'and adapted to engage aportion; of

I vthe-dooiler lying atone-side of said hole. 'a

4L; The combination of a boiler head or plate by contact with the insidesurrounding said conical end portion and,

adapted to be wedged between and to seal the joint between said end portion and the peripheral wall of said hole and a dome shaped clamping yoke having a continuous clroularedge lapping over the outer edge of the hole and serving as a stop for said bushiing, and means for drawing the cover and yoketogether.

a The combination of a boiler head or plate having a round hand, hole formed therein,

with a cover for said hole comprising abody having a conical outer end portion adapted to entersaid hole, said outer end portion being, smaller In diameter at its larger end than said hole and having an inner end por- 'tioii of larger: diameter than said hole but 1 iit'away or chamfered at opposite sides to such extent as to permit the cover to be passed, edgewise through said hole, said" cover having; a laterally extending finger roiectin i from said inner ortion and P d. a

adapted to engage portion of the boiler lying" at one, side of said hole,"a flexible bushing surrounding said conical end por- 1 tion and adapted to be wedged between and to seal the joint between said end portion and the peripheral wall of said hole, and a dome shaped clamping yoke having a continu'ous circular edge lapping over" the outer edge of the hole and serving as a stop for said bushing and means for drawing the cover and yoke together- 6. A-boiler head or plate having a round hand. hole formed therein and being cut away or chamfered at the inner edge of said hole, in, combination with a hand hole cover comprising a body having a conical ,outer end portion adapted to enter the hole to be closed, said outer end portion being smaller in diameter at its larger end than said hole and having an inner end portion of larger diameter than said hole but cut away or chamfered on opposite sides to such extent as to permit the cover to be passed edgewise through said hole, and a flexible bushing surrounding said conical end portion and adapted to'be wedged between and to seal the joint between said .end

portion and the portion of the peripheral wall of said hole at the outer side of the cut away or chamfered inner. edge of said hole.

WILLIALI F SELLERS.

a HENRY B. BRADFORD.

. Witnesses j WILLIAM G/Sronvnn,

J. E. HUBBELL. 

